Thoreau was a polluter

Economist Ed Glaeser talks about cities.  Watch for the knock on Thoreau, and the ecological disaster wrought by back-to-the-land environmentalists.  (see Stewart Brand's Ted Talk on this).
 If Prof Glaeser is right, that density is green, does this mean that organizations like the Tennessee Land Trust, who work to reduce density, are wrong?

I think the answer is clear:  the Land Trust offers tax breaks to private land holders, to keep their property from density increasing development. That they can claim that this somehow benefits the public interest is mere propaganda.